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CVE Record

CVE-2021-47614: RDMA/irdma: Fix a user-after-free in add_pble_prm

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix a user-after-free in add_pble_prm When irdma_hmc_sd_one fails, 'chunk' is freed while its still on the PBLE info list. Add the chunk entry to the PBLE info list only after successful setting of the SD in irdma_hmc_sd_one.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel bug in the RDMA irdma driver. A failed setup path can leave a freed memory object on an internal list, creating a use-after-free condition. The source bundle does not provide CVSS, confirmed impact, or active exploitation evidence.

Executive priority

Treat this as a targeted kernel maintenance issue, not a confirmed exploitation emergency. Prioritize patching systems that use RDMA or the irdma driver, and rely on Linux vendor advisories for final severity and fixed package mapping.

Technical view

In add_pble_prm, if irdma_hmc_sd_one fails, chunk is freed while still linked on the PBLE info list. The fix delays adding the chunk entry until after successful SD setup in irdma_hmc_sd_one.

Likely exposure

Exposure is most likely on Linux systems running affected kernels with the RDMA irdma driver present and relevant Intel RDMA functionality enabled. The bundle lists Linux versions including 5.14, 5.15.10, and 5.16 as affected, but does not provide deployment-specific exposure details.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation or public weaponization. Exploitability is not characterized in the supplied sources, so impact should be assessed through vendor guidance and local kernel usage.

Researcher notes

The key condition is an error path in add_pble_prm: irdma_hmc_sd_one failure frees chunk while it remains list-linked. The upstream remediation changes ordering so list insertion occurs only after successful SD setup. No CVSS, CWE, or exploit details are supplied.

Mitigation direction

  • Update affected Linux kernels to versions containing the referenced stable fixes.
  • Check Linux vendor advisories for distribution-specific fixed kernel packages.
  • Disable unused RDMA or irdma functionality where operationally safe.
  • Prioritize systems where RDMA workloads or irdma hardware are in use.

Validation and detection

  • Inventory Linux kernel versions against vendor fixed-package guidance.
  • Identify systems using or loading the irdma RDMA driver.
  • Verify deployed kernels include the referenced stable commits or equivalent backports.
  • Confirm RDMA-dependent workloads still function after patching or configuration changes.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2021-47614 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
3Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxe8c4dbc2fcacf5a7468d312168bb120c27c38b32, e8c4dbc2fcacf5a7468d312168bb120c27c38b32unaffected
LinuxLinux5.14, 0, 5.15.10, 5.16affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.